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2. Cluster headache - Wikipedia

   en.wikipedia.org/wiki/Cluster_headache

   Cluster headaches may occasionally be referred to as "alarm clock headache" because of the regularity of their recurrence. Cluster headaches often awaken individuals from sleep. Both individual attacks and the cluster grouping can have a metronomic regularity; attacks typically strike at a precise time of day each morning or night.

3. Recurrent corneal erosion - Wikipedia

   en.wikipedia.org/wiki/Recurrent_corneal_erosion

   Symptoms include recurring attacks of severe acute ocular pain, foreign-body sensation, photophobia (i.e. sensitivity to bright lights), and tearing often at the time of awakening or during sleep when the eyelids are rubbed or opened. Signs of the condition include corneal abrasion or localized roughening of the corneal epithelium, sometimes ...

4. The 6 most common headache types — and when to see a doctor

   www.aol.com/news/6-most-common-headache-types...

   A headache is a pain in the head, neck or face that is often described as a sensation of pressure that varies in location, frequency and severity, according to the National Institutes of Health.

5. Ophthalmodynia periodica - Wikipedia

   en.wikipedia.org/wiki/Ophthalmodynia_periodica

   Ophthalmodynia periodica does not have a confirmed cause, being a primary headache, but can be identified with other primary conditions. "As many as 40% of all individuals with ice pick headaches have also been diagnosed as suffering with some form of migraine headache." [4]

6. Hypnic headache - Wikipedia

   en.wikipedia.org/wiki/Hypnic_headache

   For diagnosis of hypnic headache syndrome, headaches should occur at least 15 times per month for at least one month. Included in the differential diagnosis of a new onset nighttime headaches in the elderly is drug withdrawal, temporal arteritis, Sleep apnea, oxygen desaturation, pheochromocytoma, intracranial causes, primary and secondary neoplasms, communicating hydrocephalus, subdural ...

7. What To Know if You're Constantly Getting Headaches ... - AOL

   www.aol.com/know-youre-constantly-getting...

   There can be several causes of headaches behind your eyes. They include: Vision and eye problems. According to many neurologists, a frequent cause for headaches behind your eyes, especially if you ...